Interlaboratory Study on Caprolactam Test for Food-Contact Nylon Products

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  • ナイロン製器具・容器包装におけるカプロラクタム試験の試験室間共同試験
  • ナイロンセイ キグ ・ ヨウキ ホウソウ ニ オケル カプロラクタム シケン ノ シケンシツカン キョウドウ シケン

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Abstract

<p>The Japanese Food Sanitation Law sets a limit on the migration level of caprolactam for food-contacting nylon products. Here, we carried out an interlaboratory study in twenty laboratories to evaluate the performance of the official GC-FID test method and a GC-MS method as an alternative test method to the official method. Each laboratory quantified caprolactam in three test solutions in 20% ethanol as blind duplicates using GC-FID or GC-MS. The official method (GC-FID with absolute calibration) gave trueness, repeatability (RSDr) and reproducibility (RSDr) values of 96–97%, 3.3–5.4% and 4.0–6.7%, respectively. These values met the target criteria (trueness: 80–110%, RSDr: 10%, RSDr: 25%). The performance of the method was further improved by the introduction of heptalactam as an internal standard. As for GC-MS method, some values of the RSDr exceeded 10% when absolute calibration was used. However, when an internal standard was introduced, the trueness, RSDr and RSDr of GC-MS method were all acceptable at 94–96%, 2.0–4.4% and 7.0–9.4%, respectively. Therefore, GC-MS with an internal standard is available as an alternative test method to the official method.</p>

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